Full index page is being replaced by the topic clicked

I have a suggestion. The Full Index page opens on the left most pane. But when I click and topic in it, the topic replaces the Full Index page.
Instead, will it be possible to open these topics on the right side pane, just like any other internal link on your pages. It helps keep the full index page always accessible.

Also, how are the topics in the full index page arranged? According to their date of creation? Normally topics in index pages are arranged alphabetically.